Will Congos Eat Little Harleys?

I'll try and make this simple, i want to add Harlequin Rasboras in with my Conogo tetras, but i'm now rather worried that their small juvenile size will at best mean they won't get a look in with food, and at worst they themselves, will be seen as food? so i have a plan but i see flaws. I thought i could put a group in my 90L tank, plenty of room with 4 platys and 4 minnows, BUT temp is around 22c so they will have gone from Lfs temp 23-24 to 22 and then when they are big enough put them in main tank whick is about 24c, what do you think?

Well they're in the main tank, there was a bit of a heart stopping momment when i eventually netted all six in, i had to go round to front of tank (in another room) and had a job spotting two, let alone six, Congos were going frantic like feeding time so was convinced they had torn them to shreds, but not a lot of debris, so i just wandered off and left em, now all swimming together, bit of unwanted interest from one little female congo, but looking good, biggest Harley thinks it's a Tetra